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在2×1(两发一收)MIMO、时间选择性衰落信道条件下,Alamouti码的最大分集增益近似为2。为提高分集增益、增强抗信道衰落能力,提出一种适用于时间选择性衰落信道的全速率空时码(STC-TS,Space-time Code for Time-selective Fading),通过延长发送时间,提高了信道快速变化条件下的分集增益。分析了高分集增益时编码矩阵中参数应满足的约束条件,并以“成对错误概率上界最小”为目标对编码矩阵进行了参数优化。仿真结果表明,当信道衰落速度足够快时,STC-TS编码获得了更多分集增益,进一步提高了传输的可靠性。
The maximum diversity gain of the Alamouti codes is approximately 2 for 2 × 1 (two-to-one) MIMO, time-selective fading channels. In order to improve diversity gain and enhance anti-channel fading capability, a space-time code for time-selective full-time-space-time code (STC-TS) Diversity gain under fast changing channels. The constraints that the parameters in the coding matrix should meet when the high diversity gain is analyzed are analyzed. The parameters of the coding matrix are optimized with the target of “the minimum upper bound of the pair error probability”. The simulation results show that when the channel fading speed is fast enough, the STC-TS codes obtain more diversity gain and further improve the reliability of the transmission.